数字农科院2.0

Evidence of silk growth hampering in maize at high planting density using phenotypic and transcriptional analysis

文献类型： 外文期刊

作者： ZHANG Min; XING Li-juan; REN Xiao-tian; ZOU Jun-jie; SONG Fu-peng; WANG Lei; XU Miao-yun

作者机构：

关键词： maize (Zea mays L.); high planting density; bald tip; ASI; silk expansive grow

期刊名称： Journal of Integrative Agriculture

ISSN： 2095-3119

年卷期： 2021 年

页码：

收录情况： JCR（2021版） ; CSCD（2020-2021年度） ; 农林核心（2020版） ; 科技核心（2020版）

摘要： Increasing the planting density is an effective means to increase the yield of maize (Zea mays L.), although it would also aggravate ovary apical abortion-induced bald tip of the ear, which might, in turn, reduce the yield. While the mechanism underlying the regulation of drought-related abortion in maize is well established, high planting density-related abortion in maize remains poorly understood. Therefore, the present,study was aimed to investigate the mechanism underlying the ovary apical abortion response to high density. This was achieved by evaluating the effects of four different plant densities (60000 plants ha-1 (60 k), 90000 plants ha-1(90 k), 120000 plants ha-1 (120 k), and 150000 plants ha-1 (150 k)) on plant traits related to plant architecture, plant ear, flowering time, and silk development in two inbred lines (Zheng58 and PH4CV) and two hybrid lines (Zhengdan 958 and Xianyu 335). The phenotypes of both inbred and hybrid plants were observed under different planting density treatments, and it was revealed that high planting density increased the phenotypic performance values of the evaluated traits. Anthesis-silking interval (ASI) extended, and the amount of the silks extruded from husks reduced upon increasing the planting density. Delayed silk emergence resulted in asynchronous flowering and ear bald tip. Observation of the silk cell revealed that the silk cells became smaller as planting denstiy increased. The changes in transcript abundance in the silks involved genes associated with expansive growth rather than carbon metabolism. These findings further the understanding of silk growth regulation under high planting density and provide a theoretical basis for further research on high planting density.

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